Air-feeding device for forges, furnaces, and the like.



B. H. TRIPP & H. V. RAMSAY.

AIR FEEDING DEVICE FOR FORGES, FURNAQES AND THE LIKE.

' APPLICATION FILED MAR. 11. I918- 1,276,836. Patented Aug. 27, 1918.

2 SHEETS-SHEET 1- IN VE IV TORS ATTORNEYS Y B. H. TRIPP & H. V. RAM SAY.

m FEEDING DEVICE FOR FORGES, FURNACES, AND THE LIKE.

APPLICATION FILED MAR- I! 918. 1 276,836 l I Patented Aug. 27, 9l&

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BURTON I-I. TRIPP, or PHILADELPHIA. PENNSYLVANIA, AND rIUeIIfv. RAMsAY, or GLOUCESTER CITY, NnwJERsEY.

AIR-FEEDING DEVICE FOR FORGES,FUR1\TACES, AND THE LIKE.

Specification of Letters Patent. Patented Aug. 27, 1918- Application filed. March 11, 1918. Serial No. 221,633.

To all whom'z't may concern:

Be it known that we, BURTON l-l. TRIPP, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, and HUGH V. RAMsAY, a citizen of the United States, residing at Gloucester' City, county of Camden, State of New Jersey, have invented a new and useful .Air- Feeding Device for Forges, Furnaces, and the like, of which the following is a specification. Y

Our invention, while capable of general application, relates particularly to furnaces, forges or the like, and consists in a novel construction of air feeding and pro-heating device, whereby we are enabled tointrodu'ce a limited or restricted amount of air at high pressure commingled with atmospheric air to a mixing or combustion chamber in the forge or furnace in a novel manner, whereby a large amount of air at atmospheric pressure is entrained or propelled into the furnace through the action of the high pressure jet, said commingled air at high pressure and atmospheric air being introduced to a combustion chamber of perculiar construction, whereby a circular, swirling or rotary motion is imparted to'the entrained air, thereby enabling us to evenly distribute this air to all points of combustion, thereby greatly increasing the efficiency of the forge or furnace, and at the same time reducing the expenditure of high pressure air to a.

minimum, which is a very important feature in an industrial plant.

Our invention further consists of a novel construction of ejecting device, whereby the high pressure air is wiredrawn orhas its pressure reduced to the desired extent so that not only is the use of high pressure air economized but in addition by reason of our novel arrangementofthe air feeding device in conjunction with the combustion chain ber of the forge or furnace, the air is preheated so that an extremely efficient and economical combustion'is attained.

For the purpose of illustrating our invention we have shown in the accompanying drawing one'form thereof which is at present preferred by us, since the same will'be found in practice to give satisfactory and reliable results, although it is to be under.-

stood that the various instrumentalities of which our invention consists can be VaIP ously arranged and organized and that our invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described. Figure 1 represents a side elevation of a forge or furnace embodying our invention. Fig. 2 represents, on an enlarged scale, a section on line 22 of Fig. 1.

Fig. 3 represents, on an enlarged scale, a plan view of the combustion chamber of the forge or furnace, the air'feeding device being shown in section, on line 3-3 Fig. 2.

Fig. 4 represents a plan view of a casing containing the high pressure air nozzle.

construction seen in Fig. 4;. I

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings.

While we have shown our invention as embodied inFig. 1 as particularly adapted to a small forge or furnace of moderate dimensions of the character commonly employed particularly for heating rivets and F'g. 5 represents a modification of the the like, it will be understood that in the broad aspects of our invention, the same'is capable of being used in any character of furnace Or combustion device where economy of compressed air and-an ellicient combustion is desired.

In the particular embodiment seen in Fig. 1. 1 designates the forge, 2 the firepot thereof and 3 the casing of the air preheating chamber 9, the structure of whichrwill be best understood from Figs. 2 and 3,

wherein said chamber is shown as being interiorly of concave circular or spherical contour and provided with an annular recess a, on which the lower portion of the fire-pot is supported, the latter being pro,

'VidGdfWlth a ledge 5, which supports the grate 6 of any usual or conventional type;

Thebottom of the fire-pot may be .provided with a slide"?v of any suitable conashes.

struction topermit the easy removal of the S designates an air inlet passage. whose walls diverge toward the air preheating chamber 9, said passage serving to preheat the airand discharging at thepoint 1O tangentially into said chamber, as will be understood from Fig; 3, whereby heated com mingled atmospheric. air and air at high pressure are caused to have arotary, swirl ing or c rcular movement w th n the com,- bustion chamber.

11 designates the air injecting device which consists of a body portion 12 having the end flanges 13 having the holes 14: therein through which pass bolts or otherfastening devices 15, which enter the flanges 16, whereby the air injecting device can be readily secured in position, as will be understood from Fig. 3.

17 designates the compressed air inlet passage which is threaded at 18 for the recepti on of the compressed air hose of usual constli'uction, said passage 17 discharging into a smaller passage 19, which terminates in a nozzle or port 20, said port being located in proximity to the opening of the inlet passage 8. By reason of the cut-away portions 21 around the nozzle 20, chambers 22 are formed open to atmospheric air, so that the compressed air issuing from the port 20 which is considerably wire-drawn or has its pressure reduced from its initial pressure in the supply hose,'creates a suction sufficient to entrain and carry with it a large amount of air at atmospheric pressure, "the commingled compressed air and air at atmos- 'pheric pressure entering the inlet passage 8 and being discharged at the exit 10 tangentially into the concave chamber in a rotary or swirling direction, thereby enabling us to evenly distribute the oxygen for promotion of combustion at all points, thereby greatly increasing the efficiency of the forge er-furnace and at'the same time reducing to a minimum the expenditure of high pressure air entering the chamber 17.

\Vhile' we preferably employ the construction of air feeding or injecting device seen in F igs: 3 and 1-, we may in lieu thereof if desired employ the construction seen in Fig. 5, wherein 23 designates the air injecting device, comprising the body portion A having the flanges 25 with holes 26therein. 27 designates an inlet chamber which is provided with the threaded portion 28, said inlet chamber 27 discharging the compressed "air into the contracted chamber 29 and thence into the detachable nozzle 30havin'g the exit port 31'therein. A portion of the body around the nozzle 30 is removed or cut aw'ay,as indicated'at 32, so'as to permitthe injector action of the compressed air discharged through said air por't 31 to draw atmospheric air into the inlet passage 8. It will be understood that if. desired thedevice seen in Fig. 5 may be employed in lieu of the device seen at the lower right hand portionof Fig: 3 but in practice we prefer to employ the construction seen in Fig. 3, on account of its cheapness and "simplicity.

In all the embodiments of our invention itfwill be apparent that the compressed air enteringinto the chambers 17 or 27 at the customary pressure of fromeighty to one "hundred pounds will have its pressure greatly reduced at the exit poagzo or {31,

whereby an economy in the use of compressed air is attained, while at the same time there will be sufficient pressure at the exit port 20 or 31 to create an ejector action and draw in atmospheric air from the chamber 22 or its equivalent into the flaring inlet passage 8 wherein the commingled compressed air and atmospheric air are effectively preheated by radiation and upon their exit at the point 10 will have a swirling or rotary motion imparted thereto by reason of the circular inner contour of the concave preheating chamber so that the requisite amount of air to promote combustion will be equally introduced into every portion of the furnace. By reason of the location of the elongated flaring passage 8, the commingled air will be effectively heated before its entrance into the concave preheating chamber 9, since the wall or casing 3 becomes very hot during the operation of the forge, which heat is imparted by radiation to the incoming air enteringthe passage 8.

9111 devicecan be cheaply manufactured since no machine work is required other than the tapping of the bolt holes and in case the air feeding or ejecting device becomes clogged or damaged, it can be readily removed by unskilled labor for the purposes of inspection or repair and a new ejecting device substituted therefor.

The forge seen in Fig. 1 may be supported upon a tripod or legs of a y conventional type and it will be apparent that any suitable form of grate 6 and slide or closure 7 may be employed. While we have shown our invention as particularly adapted to a light, portable forge such as is generally employed for heating rivets, it will be apparent that the same may be used in conjunction with a furnace of any character having preferably a round combustion chamber, wherein it is desired to introduce commingled preheated high pressure and atmospheric air for the purpose of controlling combustion. I

It will now be apparent that we have devised a novel and nseful construction of air feeding device'for forges, furnaces and the like, which embodies the features of advantage em'unera ted as desirable in the statement of the invention and the above description, and while we have, in the present instance, shown and described a preferred j a devicerof thebhfaracter stated, a

bottom easing inclosing a concave air pre heating chamber, an air inlet passage leading tangentially thereinto at a point intermediate the top and bottom thereof, a nozzle for high pressure air having flanges secured to flanges on said casing, said nozzle having a contracted inlet passage, a port leading therefrom, and an air chamber for atmospheric air located in proximity to said nozzle and discharging into said inlet passage for the purpose of introducing eommingled, high pressure and atmospheric air in a preheated condition into said combustion chamber. N v I 2. The combination of an air injecting dedevice, comprising a body portion having flanges, a. threaded inlet passage for high pressure air discharging into a passage of reduced diameter, having an exit port therein, thereby forming a nozzle, the space between said nozzle and flanges being cut away to permit the commingling of atmospheric air with high pressure air, a furnace having a lower concave air preheating chamber, and an enlarged inlet passage discharging into said chamber intermediate of its top and bottom for conveying compressed air and atmospheric air from said nozzle tangentially thereinto.

3. As an improved article of manufacture, an air injection device, comprising a body portion with flanges at each end thereof, a central inlet chamber for compressed air, a chamber of reduced diameter having a reduced outlet port forming a nozzle into which said inlet chamber discharges, a portion of said flanges around said nozzle being removed from the exterior of'said body to said nozzle so as to permit atmospheric air to be eommingled with the wiredrawn compressed air discharged through said nozzle.

4. As an improved article of manufacture, an air injecting device, comprising a body portion with flanges at each end thereof, a central inlet chamber for compressed air, a chamber of reduced diameter having a reduced outlet port forming a nozzle into which said inlet chamber discharges, and a portion of said flanges around said nozzle being removed from the exterior of said body to said nozzle so as to permit atmoschamber, an elongated air inlet passage cast on a side of said chamber and discharging tangentially thereinto at a point intermediate its top and bottom, the outer portion of said inlet passage terminating in flanges, an air injecting device for high pressure air having a body portion provided with flanges secured to said first mentioned flanges, and a central threaded inlet passage discharging into a. passage of reduced diameter and having a reduced exit port forming a nozzle and a portion of said body being removed from the exterior thereof to said nozzle so as to permit atmospheric air to be eommingled with the wiredrawn compressed air discharged through said nozzle.

6. In a portable rivet heating forge, a bottom interiorly concave air preheating chamber, an elongated air inlet passage cast on a side of said chamber and discharging tangentially thereinto at a point intermediate its top and bottom, the outer portion of said inlet passage terminating in flanges, an air injecting device for high pressure air having a body portion provided with flanges secured to said first mentioned flanges, and a central threaded inlet passage discharging into a passage of reduced diameter and having a reduced exit port forming a nozzle and a portion of said body being removed from the exterior thereof to said nozzle so as to permit atmospheric air to be eommingled with the wiredrawn compressed air discharged through said nozzle, in combination with a fire-pot havmg a depending annular projecting portion seated in anannular rc- BURTON H. TRIPP. HUGH V. RAMSAY.

Witnesses FRANK BRECKINRIDGE, WM. HAWKINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

